Add edition = "2018" to all Cargo.toml listings #1671
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Update the book to fix some edition-related bugs I'd love to have this included in a point release if one happens, but the changes aren't worth doing a point release on their own IMO. I'd definitely like to see this backported to beta. The most urgent changes included here are: - Chapter 19.6, on macros (including the macro changes that just stabilized), [is cut off](rust-lang/book#1668) because of an ill-placed newline in a comment that [pulldown-cmark interprets incorrectly](pulldown-cmark/pulldown-cmark#124). - [The `Cargo.toml` shown in the Guessing Game example in Chapter 2 (and one in Chapter 14) doesn't have `edition="2018"`](rust-lang/book#1671), which can be confusing depending on whether the readers have it in theirs or not, think they should remove it if they have it, and the rest of the chapter assumes it's there and the code doesn't compile if you don't have it. - The redirects implemented as part of only shipping the 2018 edition of the book sometimes lead to [having to click through 2 redirect pages](rust-lang/book#1667) when it could be just one. There are other small corrections included that were made since the last time the book was updated, but those aren't urgent. cc @steveklabnik
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Fixes #1663.
This might cause confusion because we're then relying on
edition="2018"later.